Method for producing high-strength deep drawable dual phase...

Details Method for producing high-strength deep drawable dual phase... Method for producing high-strength deep drawable dual phase...

C - Chemistry, Metallurgy

21

D

148/50.2

C21D 1/26 (2006.01) C21D 8/04 (2006.01) C21D 9/48 (2006.01) C21D 1/18 (2006.01)

Patent

CA 1182387

ABSTRACT METHOD FOR PRODUCING HIGH-STRENGTH DEEP DRAWABLE DUAL PHASE STEEL SHEETS High-strength, deep-drawable, steel sheet exhibiting dual phase properties is produced by (i) initially annealing the sheet to achieve crystallographic textures yielding high deep drawability, (ii) heating the sheet to a temperature above the Al for a time sufficient to produce from 2 to 10% austenite, and thereafter (iii) rapidly cooling to transform at least a portion of the austenite to martensite or bainite. To achieve such transformation of austenite, the composition of the steel must be selected to provide a requisite degree of hardenability.

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